if_ethersubr.c revision 1.190
1 /* $NetBSD: if_ethersubr.c,v 1.190 2012/07/17 18:08:20 christos Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)if_ethersubr.c 8.2 (Berkeley) 4/4/96 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: if_ethersubr.c,v 1.190 2012/07/17 18:08:20 christos Exp $"); 65 66 #include "opt_inet.h" 67 #include "opt_atalk.h" 68 #include "opt_iso.h" 69 #include "opt_ipx.h" 70 #include "opt_mbuftrace.h" 71 #include "opt_mpls.h" 72 #include "opt_gateway.h" 73 #include "opt_pfil_hooks.h" 74 #include "opt_pppoe.h" 75 #include "vlan.h" 76 #include "pppoe.h" 77 #include "bridge.h" 78 #include "arp.h" 79 #include "agr.h" 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/kernel.h> 84 #include <sys/callout.h> 85 #include <sys/malloc.h> 86 #include <sys/mbuf.h> 87 #include <sys/protosw.h> 88 #include <sys/socket.h> 89 #include <sys/ioctl.h> 90 #include <sys/errno.h> 91 #include <sys/syslog.h> 92 #include <sys/kauth.h> 93 #include <sys/cpu.h> 94 #include <sys/intr.h> 95 #include <sys/device.h> 96 97 #include <net/if.h> 98 #include <net/netisr.h> 99 #include <net/route.h> 100 #include <net/if_llc.h> 101 #include <net/if_dl.h> 102 #include <net/if_types.h> 103 104 #include <net/if_media.h> 105 #include <dev/mii/mii.h> 106 #include <dev/mii/miivar.h> 107 108 #if NARP == 0 109 /* 110 * XXX there should really be a way to issue this warning from within config(8) 111 */ 112 #error You have included NETATALK or a pseudo-device in your configuration that depends on the presence of ethernet interfaces, but have no such interfaces configured. Check if you really need pseudo-device bridge, pppoe, vlan or options NETATALK. 113 #endif 114 115 #include <net/bpf.h> 116 117 #include <net/if_ether.h> 118 #include <net/if_vlanvar.h> 119 120 #if NPPPOE > 0 121 #include <net/if_pppoe.h> 122 #endif 123 124 #if NAGR > 0 125 #include <net/agr/ieee8023_slowprotocols.h> /* XXX */ 126 #include <net/agr/ieee8023ad.h> 127 #include <net/agr/if_agrvar.h> 128 #endif 129 130 #if NBRIDGE > 0 131 #include <net/if_bridgevar.h> 132 #endif 133 134 #include <netinet/in.h> 135 #ifdef INET 136 #include <netinet/in_var.h> 137 #endif 138 #include <netinet/if_inarp.h> 139 140 #ifdef INET6 141 #ifndef INET 142 #include <netinet/in.h> 143 #endif 144 #include <netinet6/in6_var.h> 145 #include <netinet6/nd6.h> 146 #endif 147 148 149 #include "carp.h" 150 #if NCARP > 0 151 #include <netinet/ip_carp.h> 152 #endif 153 154 #ifdef IPX 155 #include <netipx/ipx.h> 156 #include <netipx/ipx_if.h> 157 #endif 158 159 #ifdef ISO 160 #include <netiso/argo_debug.h> 161 #include <netiso/iso.h> 162 #include <netiso/iso_var.h> 163 #include <netiso/iso_snpac.h> 164 #endif 165 166 167 168 #ifdef NETATALK 169 #include <netatalk/at.h> 170 #include <netatalk/at_var.h> 171 #include <netatalk/at_extern.h> 172 173 #define llc_snap_org_code llc_un.type_snap.org_code 174 #define llc_snap_ether_type llc_un.type_snap.ether_type 175 176 extern u_char at_org_code[3]; 177 extern u_char aarp_org_code[3]; 178 #endif /* NETATALK */ 179 180 #ifdef MPLS 181 #include <netmpls/mpls.h> 182 #include <netmpls/mpls_var.h> 183 #endif 184 185 static struct timeval bigpktppslim_last; 186 static int bigpktppslim = 2; /* XXX */ 187 static int bigpktpps_count; 188 189 190 const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = 191 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 192 const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN] = 193 { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x02 }; 194 #define senderr(e) { error = (e); goto bad;} 195 196 static int ether_output(struct ifnet *, struct mbuf *, 197 const struct sockaddr *, struct rtentry *); 198 199 /* 200 * Ethernet output routine. 201 * Encapsulate a packet of type family for the local net. 202 * Assumes that ifp is actually pointer to ethercom structure. 203 */ 204 static int 205 ether_output(struct ifnet * const ifp0, struct mbuf * const m0, 206 const struct sockaddr * const dst, 207 struct rtentry *rt0) 208 { 209 uint16_t etype = 0; 210 int error = 0, hdrcmplt = 0; 211 uint8_t esrc[6], edst[6]; 212 struct mbuf *m = m0; 213 struct rtentry *rt; 214 struct mbuf *mcopy = NULL; 215 struct ether_header *eh; 216 struct ifnet *ifp = ifp0; 217 ALTQ_DECL(struct altq_pktattr pktattr;) 218 #ifdef INET 219 struct arphdr *ah; 220 #endif /* INET */ 221 #ifdef NETATALK 222 struct at_ifaddr *aa; 223 #endif /* NETATALK */ 224 225 #ifdef MBUFTRACE 226 m_claimm(m, ifp->if_mowner); 227 #endif 228 229 #if NCARP > 0 230 if (ifp->if_type == IFT_CARP) { 231 struct ifaddr *ifa; 232 233 /* loop back if this is going to the carp interface */ 234 if (dst != NULL && ifp0->if_link_state == LINK_STATE_UP && 235 (ifa = ifa_ifwithaddr(dst)) != NULL && 236 ifa->ifa_ifp == ifp0) 237 return looutput(ifp0, m, dst, rt0); 238 239 ifp = ifp->if_carpdev; 240 /* ac = (struct arpcom *)ifp; */ 241 242 if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) != 243 (IFF_UP|IFF_RUNNING)) 244 senderr(ENETDOWN); 245 } 246 #endif /* NCARP > 0 */ 247 248 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 249 senderr(ENETDOWN); 250 if ((rt = rt0) != NULL) { 251 if ((rt->rt_flags & RTF_UP) == 0) { 252 if ((rt0 = rt = rtalloc1(dst, 1)) != NULL) { 253 rt->rt_refcnt--; 254 if (rt->rt_ifp != ifp) 255 return (*rt->rt_ifp->if_output) 256 (ifp, m0, dst, rt); 257 } else 258 senderr(EHOSTUNREACH); 259 } 260 if ((rt->rt_flags & RTF_GATEWAY) && dst->sa_family != AF_NS) { 261 if (rt->rt_gwroute == NULL) 262 goto lookup; 263 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 264 rtfree(rt); rt = rt0; 265 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 266 if ((rt = rt->rt_gwroute) == NULL) 267 senderr(EHOSTUNREACH); 268 /* the "G" test below also prevents rt == rt0 */ 269 if ((rt->rt_flags & RTF_GATEWAY) || 270 (rt->rt_ifp != ifp)) { 271 rt->rt_refcnt--; 272 rt0->rt_gwroute = NULL; 273 senderr(EHOSTUNREACH); 274 } 275 } 276 } 277 if (rt->rt_flags & RTF_REJECT) 278 if (rt->rt_rmx.rmx_expire == 0 || 279 (u_long) time_second < rt->rt_rmx.rmx_expire) 280 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); 281 } 282 283 switch (dst->sa_family) { 284 285 #ifdef INET 286 case AF_INET: 287 if (m->m_flags & M_BCAST) 288 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 289 else if (m->m_flags & M_MCAST) 290 ETHER_MAP_IP_MULTICAST(&satocsin(dst)->sin_addr, edst); 291 else if (!arpresolve(ifp, rt, m, dst, edst)) 292 return (0); /* if not yet resolved */ 293 /* If broadcasting on a simplex interface, loopback a copy */ 294 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 295 mcopy = m_copy(m, 0, (int)M_COPYALL); 296 etype = htons(ETHERTYPE_IP); 297 break; 298 299 case AF_ARP: 300 ah = mtod(m, struct arphdr *); 301 if (m->m_flags & M_BCAST) 302 (void)memcpy(edst, etherbroadcastaddr, sizeof(edst)); 303 else { 304 void *tha = ar_tha(ah); 305 306 if (tha == NULL) { 307 /* fake with ARPHDR_IEEE1394 */ 308 return 0; 309 } 310 memcpy(edst, tha, sizeof(edst)); 311 } 312 313 ah->ar_hrd = htons(ARPHRD_ETHER); 314 315 switch (ntohs(ah->ar_op)) { 316 case ARPOP_REVREQUEST: 317 case ARPOP_REVREPLY: 318 etype = htons(ETHERTYPE_REVARP); 319 break; 320 321 case ARPOP_REQUEST: 322 case ARPOP_REPLY: 323 default: 324 etype = htons(ETHERTYPE_ARP); 325 } 326 327 break; 328 #endif 329 #ifdef INET6 330 case AF_INET6: 331 if (!nd6_storelladdr(ifp, rt, m, dst, edst, sizeof(edst))){ 332 /* something bad happened */ 333 return (0); 334 } 335 etype = htons(ETHERTYPE_IPV6); 336 break; 337 #endif 338 #ifdef NETATALK 339 case AF_APPLETALK: 340 if (!aarpresolve(ifp, m, (const struct sockaddr_at *)dst, edst)) { 341 #ifdef NETATALKDEBUG 342 printf("aarpresolv failed\n"); 343 #endif /* NETATALKDEBUG */ 344 return (0); 345 } 346 /* 347 * ifaddr is the first thing in at_ifaddr 348 */ 349 aa = (struct at_ifaddr *) at_ifawithnet( 350 (const struct sockaddr_at *)dst, ifp); 351 if (aa == NULL) 352 goto bad; 353 354 /* 355 * In the phase 2 case, we need to prepend an mbuf for the 356 * llc header. Since we must preserve the value of m, 357 * which is passed to us by value, we m_copy() the first 358 * mbuf, and use it for our llc header. 359 */ 360 if (aa->aa_flags & AFA_PHASE2) { 361 struct llc llc; 362 363 M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); 364 llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; 365 llc.llc_control = LLC_UI; 366 memcpy(llc.llc_snap_org_code, at_org_code, 367 sizeof(llc.llc_snap_org_code)); 368 llc.llc_snap_ether_type = htons(ETHERTYPE_ATALK); 369 memcpy(mtod(m, void *), &llc, sizeof(struct llc)); 370 } else { 371 etype = htons(ETHERTYPE_ATALK); 372 } 373 break; 374 #endif /* NETATALK */ 375 #ifdef IPX 376 case AF_IPX: 377 etype = htons(ETHERTYPE_IPX); 378 memcpy(edst, 379 &(((const struct sockaddr_ipx *)dst)->sipx_addr.x_host), 380 sizeof(edst)); 381 /* If broadcasting on a simplex interface, loopback a copy */ 382 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 383 mcopy = m_copy(m, 0, (int)M_COPYALL); 384 break; 385 #endif 386 #ifdef ISO 387 case AF_ISO: { 388 int snpalen; 389 struct llc *l; 390 const struct sockaddr_dl *sdl; 391 392 if (rt && (sdl = satocsdl(rt->rt_gateway)) && 393 sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { 394 memcpy(edst, CLLADDR(sdl), sizeof(edst)); 395 } else { 396 error = iso_snparesolve(ifp, 397 (const struct sockaddr_iso *)dst, 398 (char *)edst, &snpalen); 399 if (error) 400 goto bad; /* Not Resolved */ 401 } 402 /* If broadcasting on a simplex interface, loopback a copy */ 403 if (*edst & 1) 404 m->m_flags |= (M_BCAST|M_MCAST); 405 if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) && 406 (mcopy = m_copy(m, 0, (int)M_COPYALL))) { 407 M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT); 408 if (mcopy) { 409 eh = mtod(mcopy, struct ether_header *); 410 memcpy(eh->ether_dhost, edst, sizeof(edst)); 411 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 412 sizeof(edst)); 413 } 414 } 415 M_PREPEND(m, 3, M_DONTWAIT); 416 if (m == NULL) 417 return (0); 418 l = mtod(m, struct llc *); 419 l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; 420 l->llc_control = LLC_UI; 421 #ifdef ARGO_DEBUG 422 if (argo_debug[D_ETHER]) { 423 int i; 424 printf("unoutput: sending pkt to: "); 425 for (i=0; i<6; i++) 426 printf("%x ", edst[i] & 0xff); 427 printf("\n"); 428 } 429 #endif 430 } break; 431 #endif /* ISO */ 432 433 case pseudo_AF_HDRCMPLT: 434 hdrcmplt = 1; 435 memcpy(esrc, 436 ((const struct ether_header *)dst->sa_data)->ether_shost, 437 sizeof(esrc)); 438 /* FALLTHROUGH */ 439 440 case AF_UNSPEC: 441 memcpy(edst, 442 ((const struct ether_header *)dst->sa_data)->ether_dhost, 443 sizeof(edst)); 444 /* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 445 etype = ((const struct ether_header *)dst->sa_data)->ether_type; 446 break; 447 448 default: 449 printf("%s: can't handle af%d\n", ifp->if_xname, 450 dst->sa_family); 451 senderr(EAFNOSUPPORT); 452 } 453 454 #ifdef MPLS 455 if (rt0 != NULL && rt_gettag(rt0) != NULL && 456 rt_gettag(rt0)->sa_family == AF_MPLS && 457 (m->m_flags & (M_MCAST | M_BCAST)) == 0) { 458 union mpls_shim msh; 459 msh.s_addr = MPLS_GETSADDR(rt0); 460 if (msh.shim.label != MPLS_LABEL_IMPLNULL) 461 etype = htons(ETHERTYPE_MPLS); 462 } 463 #endif 464 465 if (mcopy) 466 (void)looutput(ifp, mcopy, dst, rt); 467 468 /* If no ether type is set, this must be a 802.2 formatted packet. 469 */ 470 if (etype == 0) 471 etype = htons(m->m_pkthdr.len); 472 /* 473 * Add local net header. If no space in first mbuf, 474 * allocate another. 475 */ 476 M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); 477 if (m == 0) 478 senderr(ENOBUFS); 479 eh = mtod(m, struct ether_header *); 480 /* Note: etype is already in network byte order. */ 481 (void)memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type)); 482 memcpy(eh->ether_dhost, edst, sizeof(edst)); 483 if (hdrcmplt) 484 memcpy(eh->ether_shost, esrc, sizeof(eh->ether_shost)); 485 else 486 memcpy(eh->ether_shost, CLLADDR(ifp->if_sadl), 487 sizeof(eh->ether_shost)); 488 489 #if NCARP > 0 490 if (ifp0 != ifp && ifp0->if_type == IFT_CARP) { 491 memcpy(eh->ether_shost, CLLADDR(ifp0->if_sadl), 492 sizeof(eh->ether_shost)); 493 } 494 #endif /* NCARP > 0 */ 495 496 #ifdef PFIL_HOOKS 497 if ((error = pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_OUT)) != 0) 498 return (error); 499 if (m == NULL) 500 return (0); 501 #endif 502 503 #if NBRIDGE > 0 504 /* 505 * Bridges require special output handling. 506 */ 507 if (ifp->if_bridge) 508 return (bridge_output(ifp, m, NULL, NULL)); 509 #endif 510 511 #if NCARP > 0 512 if (ifp != ifp0) 513 ifp0->if_obytes += m->m_pkthdr.len + ETHER_HDR_LEN; 514 #endif /* NCARP > 0 */ 515 516 #ifdef ALTQ 517 /* 518 * If ALTQ is enabled on the parent interface, do 519 * classification; the queueing discipline might not 520 * require classification, but might require the 521 * address family/header pointer in the pktattr. 522 */ 523 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 524 altq_etherclassify(&ifp->if_snd, m, &pktattr); 525 #endif 526 return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr)); 527 528 bad: 529 if (m) 530 m_freem(m); 531 return (error); 532 } 533 534 #ifdef ALTQ 535 /* 536 * This routine is a slight hack to allow a packet to be classified 537 * if the Ethernet headers are present. It will go away when ALTQ's 538 * classification engine understands link headers. 539 */ 540 void 541 altq_etherclassify(struct ifaltq *ifq, struct mbuf *m, 542 struct altq_pktattr *pktattr) 543 { 544 struct ether_header *eh; 545 uint16_t ether_type; 546 int hlen, af, hdrsize; 547 void *hdr; 548 549 hlen = ETHER_HDR_LEN; 550 eh = mtod(m, struct ether_header *); 551 552 ether_type = htons(eh->ether_type); 553 554 if (ether_type < ETHERMTU) { 555 /* LLC/SNAP */ 556 struct llc *llc = (struct llc *)(eh + 1); 557 hlen += 8; 558 559 if (m->m_len < hlen || 560 llc->llc_dsap != LLC_SNAP_LSAP || 561 llc->llc_ssap != LLC_SNAP_LSAP || 562 llc->llc_control != LLC_UI) { 563 /* Not SNAP. */ 564 goto bad; 565 } 566 567 ether_type = htons(llc->llc_un.type_snap.ether_type); 568 } 569 570 switch (ether_type) { 571 case ETHERTYPE_IP: 572 af = AF_INET; 573 hdrsize = 20; /* sizeof(struct ip) */ 574 break; 575 576 case ETHERTYPE_IPV6: 577 af = AF_INET6; 578 hdrsize = 40; /* sizeof(struct ip6_hdr) */ 579 break; 580 581 default: 582 af = AF_UNSPEC; 583 hdrsize = 0; 584 break; 585 } 586 587 while (m->m_len <= hlen) { 588 hlen -= m->m_len; 589 m = m->m_next; 590 } 591 if (m->m_len < (hlen + hdrsize)) { 592 /* 593 * protocol header not in a single mbuf. 594 * We can't cope with this situation right 595 * now (but it shouldn't ever happen, really, anyhow). 596 */ 597 #ifdef DEBUG 598 printf("altq_etherclassify: headers span multiple mbufs: " 599 "%d < %d\n", m->m_len, (hlen + hdrsize)); 600 #endif 601 goto bad; 602 } 603 604 m->m_data += hlen; 605 m->m_len -= hlen; 606 607 hdr = mtod(m, void *); 608 609 if (ALTQ_NEEDS_CLASSIFY(ifq)) 610 pktattr->pattr_class = 611 (*ifq->altq_classify)(ifq->altq_clfier, m, af); 612 pktattr->pattr_af = af; 613 pktattr->pattr_hdr = hdr; 614 615 m->m_data -= hlen; 616 m->m_len += hlen; 617 618 return; 619 620 bad: 621 pktattr->pattr_class = NULL; 622 pktattr->pattr_hdr = NULL; 623 pktattr->pattr_af = AF_UNSPEC; 624 } 625 #endif /* ALTQ */ 626 627 /* 628 * Process a received Ethernet packet; 629 * the packet is in the mbuf chain m with 630 * the ether header. 631 */ 632 void 633 ether_input(struct ifnet *ifp, struct mbuf *m) 634 { 635 struct ethercom *ec = (struct ethercom *) ifp; 636 struct ifqueue *inq; 637 uint16_t etype; 638 struct ether_header *eh; 639 size_t ehlen; 640 #if defined (ISO) || defined (LLC) || defined(NETATALK) 641 struct llc *l; 642 #endif 643 644 if ((ifp->if_flags & IFF_UP) == 0) { 645 m_freem(m); 646 return; 647 } 648 649 #ifdef MBUFTRACE 650 m_claimm(m, &ec->ec_rx_mowner); 651 #endif 652 eh = mtod(m, struct ether_header *); 653 etype = ntohs(eh->ether_type); 654 ehlen = sizeof(*eh); 655 656 /* 657 * Determine if the packet is within its size limits. 658 */ 659 if (etype != ETHERTYPE_MPLS && m->m_pkthdr.len > 660 ETHER_MAX_FRAME(ifp, etype, m->m_flags & M_HASFCS)) { 661 if (ppsratecheck(&bigpktppslim_last, &bigpktpps_count, 662 bigpktppslim)) { 663 printf("%s: discarding oversize frame (len=%d)\n", 664 ifp->if_xname, m->m_pkthdr.len); 665 } 666 m_freem(m); 667 return; 668 } 669 670 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 671 /* 672 * If this is not a simplex interface, drop the packet 673 * if it came from us. 674 */ 675 if ((ifp->if_flags & IFF_SIMPLEX) == 0 && 676 memcmp(CLLADDR(ifp->if_sadl), eh->ether_shost, 677 ETHER_ADDR_LEN) == 0) { 678 m_freem(m); 679 return; 680 } 681 682 if (memcmp(etherbroadcastaddr, 683 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 684 m->m_flags |= M_BCAST; 685 else 686 m->m_flags |= M_MCAST; 687 ifp->if_imcasts++; 688 } 689 690 /* If the CRC is still on the packet, trim it off. */ 691 if (m->m_flags & M_HASFCS) { 692 m_adj(m, -ETHER_CRC_LEN); 693 m->m_flags &= ~M_HASFCS; 694 } 695 696 ifp->if_ibytes += m->m_pkthdr.len; 697 698 #if NBRIDGE > 0 699 /* 700 * Tap the packet off here for a bridge. bridge_input() 701 * will return NULL if it has consumed the packet, otherwise 702 * it gets processed as normal. Note that bridge_input() 703 * will always return the original packet if we need to 704 * process it locally. 705 */ 706 if (ifp->if_bridge) { 707 /* clear M_PROMISC, in case the packets comes from a vlan */ 708 m->m_flags &= ~M_PROMISC; 709 m = bridge_input(ifp, m); 710 if (m == NULL) 711 return; 712 713 /* 714 * Bridge has determined that the packet is for us. 715 * Update our interface pointer -- we may have had 716 * to "bridge" the packet locally. 717 */ 718 ifp = m->m_pkthdr.rcvif; 719 } else 720 #endif /* NBRIDGE > 0 */ 721 { 722 723 #if NCARP > 0 724 if (__predict_false(ifp->if_carp && ifp->if_type != IFT_CARP)) { 725 /* 726 * clear M_PROMISC, in case the packets comes from a 727 * vlan 728 */ 729 m->m_flags &= ~M_PROMISC; 730 if (carp_input(m, (uint8_t *)&eh->ether_shost, 731 (uint8_t *)&eh->ether_dhost, eh->ether_type) == 0) 732 return; 733 } 734 #endif /* NCARP > 0 */ 735 if ((m->m_flags & (M_BCAST|M_MCAST|M_PROMISC)) == 0 && 736 (ifp->if_flags & IFF_PROMISC) != 0 && 737 memcmp(CLLADDR(ifp->if_sadl), eh->ether_dhost, 738 ETHER_ADDR_LEN) != 0) { 739 m->m_flags |= M_PROMISC; 740 } 741 } 742 743 #ifdef PFIL_HOOKS 744 if ((m->m_flags & M_PROMISC) == 0) { 745 if (pfil_run_hooks(&ifp->if_pfil, &m, ifp, PFIL_IN) != 0) 746 return; 747 if (m == NULL) 748 return; 749 750 eh = mtod(m, struct ether_header *); 751 etype = ntohs(eh->ether_type); 752 ehlen = sizeof(*eh); 753 } 754 #endif 755 756 #if NAGR > 0 757 if (ifp->if_agrprivate && 758 __predict_true(etype != ETHERTYPE_SLOWPROTOCOLS)) { 759 m->m_flags &= ~M_PROMISC; 760 agr_input(ifp, m); 761 return; 762 } 763 #endif /* NAGR > 0 */ 764 765 /* 766 * If VLANs are configured on the interface, check to 767 * see if the device performed the decapsulation and 768 * provided us with the tag. 769 */ 770 if (ec->ec_nvlans && m_tag_find(m, PACKET_TAG_VLAN, NULL) != NULL) { 771 #if NVLAN > 0 772 /* 773 * vlan_input() will either recursively call ether_input() 774 * or drop the packet. 775 */ 776 vlan_input(ifp, m); 777 #else 778 m_freem(m); 779 #endif 780 return; 781 } 782 783 /* 784 * Handle protocols that expect to have the Ethernet header 785 * (and possibly FCS) intact. 786 */ 787 switch (etype) { 788 case ETHERTYPE_VLAN: { 789 struct ether_vlan_header *evl = (void *)eh; 790 /* 791 * If there is a tag of 0, then the VLAN header was probably 792 * just being used to store the priority. Extract the ether 793 * type, and if IP or IPV6, let them deal with it. 794 */ 795 if (m->m_len <= sizeof(*evl) 796 && EVL_VLANOFTAG(evl->evl_tag) == 0) { 797 etype = ntohs(evl->evl_proto); 798 ehlen = sizeof(*evl); 799 if ((m->m_flags & M_PROMISC) == 0 800 && (etype == ETHERTYPE_IP 801 || etype == ETHERTYPE_IPV6)) 802 break; 803 } 804 #if NVLAN > 0 805 /* 806 * vlan_input() will either recursively call ether_input() 807 * or drop the packet. 808 */ 809 if (((struct ethercom *)ifp)->ec_nvlans != 0) 810 vlan_input(ifp, m); 811 else 812 #endif /* NVLAN > 0 */ 813 m_freem(m); 814 return; 815 } 816 #if NPPPOE > 0 817 case ETHERTYPE_PPPOEDISC: 818 case ETHERTYPE_PPPOE: 819 if (m->m_flags & M_PROMISC) { 820 m_freem(m); 821 return; 822 } 823 #ifndef PPPOE_SERVER 824 if (m->m_flags & (M_MCAST | M_BCAST)) { 825 m_freem(m); 826 return; 827 } 828 #endif 829 830 if (etype == ETHERTYPE_PPPOEDISC) 831 inq = &ppoediscinq; 832 else 833 inq = &ppoeinq; 834 if (IF_QFULL(inq)) { 835 IF_DROP(inq); 836 m_freem(m); 837 } else 838 IF_ENQUEUE(inq, m); 839 softint_schedule(pppoe_softintr); 840 return; 841 #endif /* NPPPOE > 0 */ 842 case ETHERTYPE_SLOWPROTOCOLS: { 843 uint8_t subtype; 844 845 #if defined(DIAGNOSTIC) 846 if (m->m_pkthdr.len < sizeof(*eh) + sizeof(subtype)) { 847 panic("ether_input: too short slow protocol packet"); 848 } 849 #endif 850 m_copydata(m, sizeof(*eh), sizeof(subtype), &subtype); 851 switch (subtype) { 852 #if NAGR > 0 853 case SLOWPROTOCOLS_SUBTYPE_LACP: 854 if (ifp->if_agrprivate) { 855 ieee8023ad_lacp_input(ifp, m); 856 return; 857 } 858 break; 859 860 case SLOWPROTOCOLS_SUBTYPE_MARKER: 861 if (ifp->if_agrprivate) { 862 ieee8023ad_marker_input(ifp, m); 863 return; 864 } 865 break; 866 #endif /* NAGR > 0 */ 867 default: 868 if (subtype == 0 || subtype > 10) { 869 /* illegal value */ 870 m_freem(m); 871 return; 872 } 873 /* unknown subtype */ 874 break; 875 } 876 /* FALLTHROUGH */ 877 } 878 default: 879 if (m->m_flags & M_PROMISC) { 880 m_freem(m); 881 return; 882 } 883 } 884 885 /* If the CRC is still on the packet, trim it off. */ 886 if (m->m_flags & M_HASFCS) { 887 m_adj(m, -ETHER_CRC_LEN); 888 m->m_flags &= ~M_HASFCS; 889 } 890 891 if (etype > ETHERMTU + sizeof (struct ether_header)) { 892 /* Strip off the Ethernet header. */ 893 m_adj(m, ehlen); 894 895 switch (etype) { 896 #ifdef INET 897 case ETHERTYPE_IP: 898 #ifdef GATEWAY 899 if (ipflow_fastforward(m)) 900 return; 901 #endif 902 schednetisr(NETISR_IP); 903 inq = &ipintrq; 904 break; 905 906 case ETHERTYPE_ARP: 907 schednetisr(NETISR_ARP); 908 inq = &arpintrq; 909 break; 910 911 case ETHERTYPE_REVARP: 912 revarpinput(m); /* XXX queue? */ 913 return; 914 #endif 915 #ifdef INET6 916 case ETHERTYPE_IPV6: 917 #ifdef GATEWAY 918 if (ip6flow_fastforward(m)) 919 return; 920 #endif 921 schednetisr(NETISR_IPV6); 922 inq = &ip6intrq; 923 break; 924 #endif 925 #ifdef IPX 926 case ETHERTYPE_IPX: 927 schednetisr(NETISR_IPX); 928 inq = &ipxintrq; 929 break; 930 #endif 931 #ifdef NETATALK 932 case ETHERTYPE_ATALK: 933 schednetisr(NETISR_ATALK); 934 inq = &atintrq1; 935 break; 936 case ETHERTYPE_AARP: 937 /* probably this should be done with a NETISR as well */ 938 aarpinput(ifp, m); /* XXX */ 939 return; 940 #endif /* NETATALK */ 941 #ifdef MPLS 942 case ETHERTYPE_MPLS: 943 schednetisr(NETISR_MPLS); 944 inq = &mplsintrq; 945 break; 946 #endif 947 default: 948 m_freem(m); 949 return; 950 } 951 } else { 952 #if defined (ISO) || defined (LLC) || defined (NETATALK) 953 l = (struct llc *)(eh+1); 954 switch (l->llc_dsap) { 955 #ifdef NETATALK 956 case LLC_SNAP_LSAP: 957 switch (l->llc_control) { 958 case LLC_UI: 959 if (l->llc_ssap != LLC_SNAP_LSAP) { 960 goto dropanyway; 961 } 962 963 if (memcmp(&(l->llc_snap_org_code)[0], 964 at_org_code, sizeof(at_org_code)) == 0 && 965 ntohs(l->llc_snap_ether_type) == 966 ETHERTYPE_ATALK) { 967 inq = &atintrq2; 968 m_adj(m, sizeof(struct ether_header) 969 + sizeof(struct llc)); 970 schednetisr(NETISR_ATALK); 971 break; 972 } 973 974 if (memcmp(&(l->llc_snap_org_code)[0], 975 aarp_org_code, 976 sizeof(aarp_org_code)) == 0 && 977 ntohs(l->llc_snap_ether_type) == 978 ETHERTYPE_AARP) { 979 m_adj( m, sizeof(struct ether_header) 980 + sizeof(struct llc)); 981 aarpinput(ifp, m); /* XXX */ 982 return; 983 } 984 985 default: 986 goto dropanyway; 987 } 988 break; 989 #endif /* NETATALK */ 990 #ifdef ISO 991 case LLC_ISO_LSAP: 992 switch (l->llc_control) { 993 case LLC_UI: 994 /* LLC_UI_P forbidden in class 1 service */ 995 if ((l->llc_dsap == LLC_ISO_LSAP) && /* XXX? case tested */ 996 (l->llc_ssap == LLC_ISO_LSAP)) { 997 /* LSAP for ISO */ 998 /* XXX length computation?? */ 999 if (m->m_pkthdr.len > etype + sizeof(struct ether_header)) 1000 m_adj(m, etype - m->m_pkthdr.len); 1001 1002 #ifdef ARGO_DEBUG 1003 if (argo_debug[D_ETHER]) 1004 printf("clnp packet"); 1005 #endif 1006 schednetisr(NETISR_ISO); 1007 inq = &clnlintrq; 1008 break; 1009 } 1010 goto dropanyway; 1011 1012 case LLC_XID: 1013 case LLC_XID_P: 1014 if(m->m_len < LLC_XID_BASIC_MINLEN + sizeof(struct ether_header)) 1015 /* XXX m_pullup? */ 1016 goto dropanyway; 1017 l->llc_window = 0; 1018 l->llc_fid = LLC_XID_FORMAT_BASIC; 1019 l->llc_class = LLC_XID_CLASS_I; 1020 l->llc_dsap = l->llc_ssap = 0; 1021 /* Fall through to */ 1022 case LLC_TEST: 1023 case LLC_TEST_P: 1024 { 1025 struct sockaddr sa; 1026 struct ether_header *eh2; 1027 int i; 1028 u_char c = l->llc_dsap; 1029 1030 l->llc_dsap = l->llc_ssap; 1031 l->llc_ssap = c; 1032 m_adj(m, sizeof(struct ether_header)); 1033 /* XXX we can optimize here? */ 1034 if (m->m_flags & (M_BCAST | M_MCAST)) 1035 memcpy(eh->ether_dhost, 1036 CLLADDR(ifp->if_sadl), 1037 ETHER_ADDR_LEN); 1038 sa.sa_family = AF_UNSPEC; 1039 sa.sa_len = sizeof(sa); 1040 eh2 = (struct ether_header *)sa.sa_data; 1041 for (i = 0; i < 6; i++) { 1042 eh2->ether_shost[i] = c = 1043 eh->ether_dhost[i]; 1044 eh2->ether_dhost[i] = 1045 eh->ether_dhost[i] = 1046 eh->ether_shost[i]; 1047 eh->ether_shost[i] = c; 1048 } 1049 ifp->if_output(ifp, m, &sa, NULL); 1050 return; 1051 } 1052 default: 1053 m_freem(m); 1054 return; 1055 } 1056 break; 1057 #endif /* ISO */ 1058 #if defined (ISO) || defined (NETATALK) 1059 dropanyway: 1060 #endif 1061 default: 1062 m_freem(m); 1063 return; 1064 } 1065 #else /* ISO || LLC || NETATALK*/ 1066 m_freem(m); 1067 return; 1068 #endif /* ISO || LLC || NETATALK*/ 1069 } 1070 1071 if (IF_QFULL(inq)) { 1072 IF_DROP(inq); 1073 m_freem(m); 1074 } else 1075 IF_ENQUEUE(inq, m); 1076 } 1077 1078 /* 1079 * Convert Ethernet address to printable (loggable) representation. 1080 */ 1081 char * 1082 ether_sprintf(const u_char *ap) 1083 { 1084 static char etherbuf[3 * ETHER_ADDR_LEN]; 1085 return ether_snprintf(etherbuf, sizeof(etherbuf), ap); 1086 } 1087 1088 char * 1089 ether_snprintf(char *buf, size_t len, const u_char *ap) 1090 { 1091 char *cp = buf; 1092 size_t i; 1093 1094 for (i = 0; i < len / 3; i++) { 1095 *cp++ = hexdigits[*ap >> 4]; 1096 *cp++ = hexdigits[*ap++ & 0xf]; 1097 *cp++ = ':'; 1098 } 1099 *--cp = '\0'; 1100 return buf; 1101 } 1102 1103 /* 1104 * Perform common duties while attaching to interface list 1105 */ 1106 void 1107 ether_ifattach(struct ifnet *ifp, const uint8_t *lla) 1108 { 1109 struct ethercom *ec = (struct ethercom *)ifp; 1110 1111 ifp->if_type = IFT_ETHER; 1112 ifp->if_hdrlen = ETHER_HDR_LEN; 1113 ifp->if_dlt = DLT_EN10MB; 1114 ifp->if_mtu = ETHERMTU; 1115 ifp->if_output = ether_output; 1116 ifp->if_input = ether_input; 1117 if (ifp->if_baudrate == 0) 1118 ifp->if_baudrate = IF_Mbps(10); /* just a default */ 1119 1120 if_set_sadl(ifp, lla, ETHER_ADDR_LEN, !ETHER_IS_LOCAL(lla)); 1121 1122 LIST_INIT(&ec->ec_multiaddrs); 1123 ifp->if_broadcastaddr = etherbroadcastaddr; 1124 bpf_attach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 1125 #ifdef MBUFTRACE 1126 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 1127 sizeof(ec->ec_tx_mowner.mo_name)); 1128 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 1129 sizeof(ec->ec_tx_mowner.mo_descr)); 1130 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 1131 sizeof(ec->ec_rx_mowner.mo_name)); 1132 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 1133 sizeof(ec->ec_rx_mowner.mo_descr)); 1134 MOWNER_ATTACH(&ec->ec_tx_mowner); 1135 MOWNER_ATTACH(&ec->ec_rx_mowner); 1136 ifp->if_mowner = &ec->ec_tx_mowner; 1137 #endif 1138 } 1139 1140 void 1141 ether_ifdetach(struct ifnet *ifp) 1142 { 1143 struct ethercom *ec = (void *) ifp; 1144 struct ether_multi *enm; 1145 int s; 1146 1147 /* 1148 * Prevent further calls to ioctl (for example turning off 1149 * promiscuous mode from the bridge code), which eventually can 1150 * call if_init() which can cause panics because the interface 1151 * is in the process of being detached. Return device not configured 1152 * instead. 1153 */ 1154 ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio; 1155 1156 #if NBRIDGE > 0 1157 if (ifp->if_bridge) 1158 bridge_ifdetach(ifp); 1159 #endif 1160 1161 bpf_detach(ifp); 1162 1163 #if NVLAN > 0 1164 if (ec->ec_nvlans) 1165 vlan_ifdetach(ifp); 1166 #endif 1167 1168 s = splnet(); 1169 while ((enm = LIST_FIRST(&ec->ec_multiaddrs)) != NULL) { 1170 LIST_REMOVE(enm, enm_list); 1171 free(enm, M_IFMADDR); 1172 ec->ec_multicnt--; 1173 } 1174 splx(s); 1175 1176 #if 0 /* done in if_detach() */ 1177 if_free_sadl(ifp); 1178 #endif 1179 1180 ifp->if_mowner = NULL; 1181 MOWNER_DETACH(&ec->ec_rx_mowner); 1182 MOWNER_DETACH(&ec->ec_tx_mowner); 1183 } 1184 1185 #if 0 1186 /* 1187 * This is for reference. We have a table-driven version 1188 * of the little-endian crc32 generator, which is faster 1189 * than the double-loop. 1190 */ 1191 uint32_t 1192 ether_crc32_le(const uint8_t *buf, size_t len) 1193 { 1194 uint32_t c, crc, carry; 1195 size_t i, j; 1196 1197 crc = 0xffffffffU; /* initial value */ 1198 1199 for (i = 0; i < len; i++) { 1200 c = buf[i]; 1201 for (j = 0; j < 8; j++) { 1202 carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01); 1203 crc >>= 1; 1204 c >>= 1; 1205 if (carry) 1206 crc = (crc ^ ETHER_CRC_POLY_LE); 1207 } 1208 } 1209 1210 return (crc); 1211 } 1212 #else 1213 uint32_t 1214 ether_crc32_le(const uint8_t *buf, size_t len) 1215 { 1216 static const uint32_t crctab[] = { 1217 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 1218 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 1219 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 1220 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 1221 }; 1222 uint32_t crc; 1223 size_t i; 1224 1225 crc = 0xffffffffU; /* initial value */ 1226 1227 for (i = 0; i < len; i++) { 1228 crc ^= buf[i]; 1229 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1230 crc = (crc >> 4) ^ crctab[crc & 0xf]; 1231 } 1232 1233 return (crc); 1234 } 1235 #endif 1236 1237 uint32_t 1238 ether_crc32_be(const uint8_t *buf, size_t len) 1239 { 1240 uint32_t c, crc, carry; 1241 size_t i, j; 1242 1243 crc = 0xffffffffU; /* initial value */ 1244 1245 for (i = 0; i < len; i++) { 1246 c = buf[i]; 1247 for (j = 0; j < 8; j++) { 1248 carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01); 1249 crc <<= 1; 1250 c >>= 1; 1251 if (carry) 1252 crc = (crc ^ ETHER_CRC_POLY_BE) | carry; 1253 } 1254 } 1255 1256 return (crc); 1257 } 1258 1259 #ifdef INET 1260 const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN] = 1261 { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 }; 1262 const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN] = 1263 { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff }; 1264 #endif 1265 #ifdef INET6 1266 const uint8_t ether_ip6multicast_min[ETHER_ADDR_LEN] = 1267 { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; 1268 const uint8_t ether_ip6multicast_max[ETHER_ADDR_LEN] = 1269 { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff }; 1270 #endif 1271 1272 /* 1273 * ether_aton implementation, not using a static buffer. 1274 */ 1275 int 1276 ether_aton_r(u_char *dest, size_t len, const char *str) 1277 { 1278 const u_char *cp = (const void *)str; 1279 u_char *ep; 1280 1281 #define atox(c) (((c) <= '9') ? ((c) - '0') : ((toupper(c) - 'A') + 10)) 1282 1283 if (len < ETHER_ADDR_LEN) 1284 return ENOSPC; 1285 1286 ep = dest + ETHER_ADDR_LEN; 1287 1288 while (*cp) { 1289 if (!isxdigit(*cp)) 1290 return EINVAL; 1291 *dest = atox(*cp); 1292 cp++; 1293 if (isxdigit(*cp)) { 1294 *dest = (*dest << 4) | atox(*cp); 1295 dest++; 1296 cp++; 1297 } else 1298 dest++; 1299 if (dest == ep) 1300 return *cp == '\0' ? 0 : ENAMETOOLONG; 1301 switch (*cp) { 1302 case ':': 1303 case '-': 1304 case '.': 1305 cp++; 1306 break; 1307 } 1308 } 1309 return ENOBUFS; 1310 } 1311 1312 /* 1313 * Convert a sockaddr into an Ethernet address or range of Ethernet 1314 * addresses. 1315 */ 1316 int 1317 ether_multiaddr(const struct sockaddr *sa, uint8_t addrlo[ETHER_ADDR_LEN], 1318 uint8_t addrhi[ETHER_ADDR_LEN]) 1319 { 1320 #ifdef INET 1321 const struct sockaddr_in *sin; 1322 #endif /* INET */ 1323 #ifdef INET6 1324 const struct sockaddr_in6 *sin6; 1325 #endif /* INET6 */ 1326 1327 switch (sa->sa_family) { 1328 1329 case AF_UNSPEC: 1330 memcpy(addrlo, sa->sa_data, ETHER_ADDR_LEN); 1331 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1332 break; 1333 1334 #ifdef INET 1335 case AF_INET: 1336 sin = satocsin(sa); 1337 if (sin->sin_addr.s_addr == INADDR_ANY) { 1338 /* 1339 * An IP address of INADDR_ANY means listen to 1340 * or stop listening to all of the Ethernet 1341 * multicast addresses used for IP. 1342 * (This is for the sake of IP multicast routers.) 1343 */ 1344 memcpy(addrlo, ether_ipmulticast_min, ETHER_ADDR_LEN); 1345 memcpy(addrhi, ether_ipmulticast_max, ETHER_ADDR_LEN); 1346 } 1347 else { 1348 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo); 1349 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1350 } 1351 break; 1352 #endif 1353 #ifdef INET6 1354 case AF_INET6: 1355 sin6 = satocsin6(sa); 1356 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 1357 /* 1358 * An IP6 address of 0 means listen to or stop 1359 * listening to all of the Ethernet multicast 1360 * address used for IP6. 1361 * (This is used for multicast routers.) 1362 */ 1363 memcpy(addrlo, ether_ip6multicast_min, ETHER_ADDR_LEN); 1364 memcpy(addrhi, ether_ip6multicast_max, ETHER_ADDR_LEN); 1365 } else { 1366 ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo); 1367 memcpy(addrhi, addrlo, ETHER_ADDR_LEN); 1368 } 1369 break; 1370 #endif 1371 1372 default: 1373 return EAFNOSUPPORT; 1374 } 1375 return 0; 1376 } 1377 1378 /* 1379 * Add an Ethernet multicast address or range of addresses to the list for a 1380 * given interface. 1381 */ 1382 int 1383 ether_addmulti(const struct sockaddr *sa, struct ethercom *ec) 1384 { 1385 struct ether_multi *enm; 1386 u_char addrlo[ETHER_ADDR_LEN]; 1387 u_char addrhi[ETHER_ADDR_LEN]; 1388 int s = splnet(), error; 1389 1390 error = ether_multiaddr(sa, addrlo, addrhi); 1391 if (error != 0) { 1392 splx(s); 1393 return error; 1394 } 1395 1396 /* 1397 * Verify that we have valid Ethernet multicast addresses. 1398 */ 1399 if (!ETHER_IS_MULTICAST(addrlo) || !ETHER_IS_MULTICAST(addrhi)) { 1400 splx(s); 1401 return EINVAL; 1402 } 1403 /* 1404 * See if the address range is already in the list. 1405 */ 1406 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1407 if (enm != NULL) { 1408 /* 1409 * Found it; just increment the reference count. 1410 */ 1411 ++enm->enm_refcount; 1412 splx(s); 1413 return 0; 1414 } 1415 /* 1416 * New address or range; malloc a new multicast record 1417 * and link it into the interface's multicast list. 1418 */ 1419 enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT); 1420 if (enm == NULL) { 1421 splx(s); 1422 return ENOBUFS; 1423 } 1424 memcpy(enm->enm_addrlo, addrlo, 6); 1425 memcpy(enm->enm_addrhi, addrhi, 6); 1426 enm->enm_refcount = 1; 1427 LIST_INSERT_HEAD(&ec->ec_multiaddrs, enm, enm_list); 1428 ec->ec_multicnt++; 1429 splx(s); 1430 /* 1431 * Return ENETRESET to inform the driver that the list has changed 1432 * and its reception filter should be adjusted accordingly. 1433 */ 1434 return ENETRESET; 1435 } 1436 1437 /* 1438 * Delete a multicast address record. 1439 */ 1440 int 1441 ether_delmulti(const struct sockaddr *sa, struct ethercom *ec) 1442 { 1443 struct ether_multi *enm; 1444 u_char addrlo[ETHER_ADDR_LEN]; 1445 u_char addrhi[ETHER_ADDR_LEN]; 1446 int s = splnet(), error; 1447 1448 error = ether_multiaddr(sa, addrlo, addrhi); 1449 if (error != 0) { 1450 splx(s); 1451 return (error); 1452 } 1453 1454 /* 1455 * Look ur the address in our list. 1456 */ 1457 ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm); 1458 if (enm == NULL) { 1459 splx(s); 1460 return (ENXIO); 1461 } 1462 if (--enm->enm_refcount != 0) { 1463 /* 1464 * Still some claims to this record. 1465 */ 1466 splx(s); 1467 return (0); 1468 } 1469 /* 1470 * No remaining claims to this record; unlink and free it. 1471 */ 1472 LIST_REMOVE(enm, enm_list); 1473 free(enm, M_IFMADDR); 1474 ec->ec_multicnt--; 1475 splx(s); 1476 /* 1477 * Return ENETRESET to inform the driver that the list has changed 1478 * and its reception filter should be adjusted accordingly. 1479 */ 1480 return (ENETRESET); 1481 } 1482 1483 void 1484 ether_set_ifflags_cb(struct ethercom *ec, ether_cb_t cb) 1485 { 1486 ec->ec_ifflags_cb = cb; 1487 } 1488 1489 /* 1490 * Common ioctls for Ethernet interfaces. Note, we must be 1491 * called at splnet(). 1492 */ 1493 int 1494 ether_ioctl(struct ifnet *ifp, u_long cmd, void *data) 1495 { 1496 struct ethercom *ec = (void *) ifp; 1497 struct ifreq *ifr = (struct ifreq *)data; 1498 struct if_laddrreq *iflr = data; 1499 const struct sockaddr_dl *sdl; 1500 static const uint8_t zero[ETHER_ADDR_LEN]; 1501 int error; 1502 1503 switch (cmd) { 1504 case SIOCINITIFADDR: 1505 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 1506 (IFF_UP|IFF_RUNNING)) { 1507 ifp->if_flags |= IFF_UP; 1508 if ((error = (*ifp->if_init)(ifp)) != 0) 1509 return error; 1510 } 1511 #ifdef INET 1512 { 1513 struct ifaddr *ifa = (struct ifaddr *)data; 1514 1515 if (ifa->ifa_addr->sa_family == AF_INET) 1516 arp_ifinit(ifp, ifa); 1517 } 1518 #endif /* INET */ 1519 return 0; 1520 1521 case SIOCSIFMTU: 1522 { 1523 int maxmtu; 1524 1525 if (ec->ec_capabilities & ETHERCAP_JUMBO_MTU) 1526 maxmtu = ETHERMTU_JUMBO; 1527 else 1528 maxmtu = ETHERMTU; 1529 1530 if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > maxmtu) 1531 return EINVAL; 1532 else if ((error = ifioctl_common(ifp, cmd, data)) != ENETRESET) 1533 return error; 1534 else if (ifp->if_flags & IFF_UP) { 1535 /* Make sure the device notices the MTU change. */ 1536 return (*ifp->if_init)(ifp); 1537 } else 1538 return 0; 1539 } 1540 1541 case SIOCSIFFLAGS: 1542 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1543 return error; 1544 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 1545 case IFF_RUNNING: 1546 /* 1547 * If interface is marked down and it is running, 1548 * then stop and disable it. 1549 */ 1550 (*ifp->if_stop)(ifp, 1); 1551 break; 1552 case IFF_UP: 1553 /* 1554 * If interface is marked up and it is stopped, then 1555 * start it. 1556 */ 1557 return (*ifp->if_init)(ifp); 1558 case IFF_UP|IFF_RUNNING: 1559 error = 0; 1560 if (ec->ec_ifflags_cb == NULL || 1561 (error = (*ec->ec_ifflags_cb)(ec)) == ENETRESET) { 1562 /* 1563 * Reset the interface to pick up 1564 * changes in any other flags that 1565 * affect the hardware state. 1566 */ 1567 return (*ifp->if_init)(ifp); 1568 } else 1569 return error; 1570 case 0: 1571 break; 1572 } 1573 return 0; 1574 case SIOCADDMULTI: 1575 return ether_addmulti(ifreq_getaddr(cmd, ifr), ec); 1576 case SIOCDELMULTI: 1577 return ether_delmulti(ifreq_getaddr(cmd, ifr), ec); 1578 case SIOCSIFMEDIA: 1579 case SIOCGIFMEDIA: 1580 if (ec->ec_mii == NULL) 1581 return ENOTTY; 1582 return ifmedia_ioctl(ifp, ifr, &ec->ec_mii->mii_media, cmd); 1583 case SIOCALIFADDR: 1584 sdl = satocsdl(sstocsa(&iflr->addr)); 1585 if (sdl->sdl_family != AF_LINK) 1586 ; 1587 else if (ETHER_IS_MULTICAST(CLLADDR(sdl))) 1588 return EINVAL; 1589 else if (memcmp(zero, CLLADDR(sdl), sizeof(zero)) == 0) 1590 return EINVAL; 1591 /*FALLTHROUGH*/ 1592 default: 1593 return ifioctl_common(ifp, cmd, data); 1594 } 1595 return 0; 1596 } 1597
Indexes created Mon Sep 22 05:09:51 GMT 2025